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The Buffett Tax Loss

It turns out this Obama proposal will cost federal revenue.

April 13, 2012 7:16 p.m. ET

The case for the Buffett tax keeps eroding. When President Obama announced the idea, he said it would help "stabilize our debt and deficits over the next decade." Then came the inconvenient revelation that the new 30% millionaire's tax would raise only $46.7 billion over 10 years, and would leave about 99.5% of the deficit intact in 2013. It was a far cry from "stabilizing the debt."

Now we learn that the Buffett tax the Senate is expected to vote on early next week will make the deficit worse. That's...